.popup__submit {
    min-width: 100%;
    min-height: 50px;
    background-color: #000;
    color: #fff;
    outline: none;
    padding: 0;
    border: 0;
    border-radius: 2px;
    transition: 1s;
}

.popup__submit:hover {
    opacity: 0.8;
    cursor: pointer;
}